正常人血清中含量最低的免疫球蛋白是（） A.IgM B.IgA C.IgD D.Ig 发布时间：2019-01-10 14:00 │ 来源：www.tikuol.com 题型：单项选择题 问题： 正常人血清中含量最低的免疫球蛋白是（）A.IgMB.IgAC.IgDD.IgEE.IgG
题型：单项选择题 从方框中选择适当的单词，将短文补充完整。what, blind, coach, helping, something, though, specially, elementary, out, how Have you ever seen guide dogs? Guide dogs are the best "helping hands" for the __1__. Most guide dogs are both their eyes and their good friends. __2__ makes dogs become guide dogs? The __3__ requirement (要求) is that a guide dog must be healthy and have a good temper (脾气). Second, one of the dog's parents must be a guide dog. Third, when they are two months old, they would be sent to the training center. People there __4__ them how to get along with people. Then they can understand __5__ to help people. Fourth, when they are one year old, they have to return to the training center to learn moreskills about __6__ people. Then, if they pass the test, they will be guide dogs. Guide dogs help the blind __7__. Can other animals help disabled people? Now, some other animalsare being trained to help them. In the USA, some monkeys have been __8__ trained to help those people that can't move any more. The monkeys can put a CD into the CD player, open the fridge (冰箱) to get__9__, turn on the light and even hand the owner the TV remote control (遥控器). __10__ these are simple tasks, the monkeys have to have about 18 to 24 months'training to be able to do them. Animals are not only people's pets, but also our best helpers. 查看答案